Chamber Sentry | Artifact Creature | Construct | Chamber Sentry enters the battlefield with a +1/+1 counter on it for each color of mana spent to cast it.
{X}, {T}, Remove X +1/+1 counters from Chamber Sentry: It deals X damage to any target.
{W}{U}{B}{R}{G}: Return Chamber Sentry from your graveyard to your hand. | Adam Paquette
4.0 LSV
Gatekeeper Gargoyle | Artifact Creature | Gargoyle | Flying
Gatekeeper Gargoyle enters the battlefield with a +1/+1 counter on it for each Gate you control. | Adam Paquette
2.5 LSV
Rampaging Monument | Artifact Creature | Cleric | Trample
Rampaging Monument enters the battlefield with three +1/+1 counters on it.
Whenever you cast a multicolored spell, put a +1/+1 counter on Rampaging Monument. | Tyler Walpole
3.5 LSV